Pittsburgh Theological Seminary
is a graduate professional institution of the Presbyterian Church (U.S.A). Formed by the mergers of several Presbyterian seminaries, the earliest dating from 1794, the Seminary campus is located in Pittsburgh, Pennsylvania. The Clifford E. Barbour Library
at PTS houses a collection of more than 400,000 cataloged items, mainly in Protestant theology and Biblical studies. Specialized holdings include works in the Presbyterian and Reformed tradition, particularly in the areas of theology, church history, missions, ecumenics, and hymnology. The library also houses the Seminary Archives.